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The basic principle of waveband switching (WBS) is to group multiple wavelengths together as a band or fiber and switch the group using a single port whenever possible. To support waveband grouping in WBS networks, multi-granular optical cross-connects (MG-OXCs) are introduced to switch the traffic at the fiber, band, and wavelength layers. One important goal in WBS networks is to minimize the number...
This paper presents and compares different TE information dissemination strategies between Path Computation Elements (PCEs) in multi-domain optical networks. In such network context, recent studies have found that path computation only with local domain visibility yields poor network performance. Accordingly, certain visibility between domains seems necessary. Aiming to fit the confidentiality requirements...
Reconfigurable Optical Add / Drop Multiplexer is a subsystem of All Optical Networks. In this paper we analyze the routing performance of different ROADMs at dynamic traffic using Bernoulli, Poisson and Pascal distribution models. A theoretical routing power model is considered and through simulation results, the routing power and blocking probability have been evaluated to achieve better performance...
In the optimization of operational networks the most important target is the minimization of congestion. Congestion can be divided into two types, congestion in the case where resources are insufficient to carry all the traffic, and congestion in the case where resources are divided inefficiently so that a part of the network is over-utilized while another part of the network has unused band-width...
Deflection routing is a much-studied contention resolution technique in the context of Optical Burst/Packet Switching networks, as it promises to improve burst blocking performance and may reduce or even eliminate buffer requirements. An OBS-based Grid is frequently based on anycast routing, which holds even greater potential to use the deflection technique for successful delivery of Grid jobs. As...
Optical burst switching (OBS) networks can benefit from optical buffering at the core nodes. Unfortunately, optical fibre delay line (FDL) buffers require additional switch ports, thereby increasing the switch size and cost. In this paper, an alternative and relatively uncommon view is taken towards core buffering in optical networks. Switch channel ports at underutilized links are replaced by buffer...
In OPS networks, the contention resolution is one of the main problems. To reduce these contention events, we aim the effective use of wavelength resources with a routing and wavelength assignment method. In addition to this, the collision avoidance devices, such as wavelength converters, can improve the network performance more flexibly. The proposed method focuses on not only how to assign route...
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